The change means private data collected by one Google service can be shared with its other platforms including YouTube, Gmail and Blogger.
Google said the new set up will enable it to tailor search results better.
But data regulators in France have cast doubt on the legality of move and have launched a Europe-wide investigation.
Caroline Hepker reports from New York on why Google has made its move now.
- 1 March 2012
- BBC News